I cannot change Time Machine interval with Terminal

Time Machine worked every 6 hours under Leopard using command
sudo defaults write /System/Library/LaunchDaemons/com.apple.backupd-auto StartInterval -int 21600
but it doesn't work under Snow Leopard. I mean, TM backups every hour.
In fact, I opened com.apple.backupd-auto and check StartInterval but the property is 21600.
Does anyone have an idea or suggestion?

make sure that the permissions on the launch daemon are correct.
run
sudo chmod 644 /System/Library/LaunchDaemons/com.apple.backupd-auto.plist
and restart.

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